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Migration from Apache to Lighttpd

"Now starting from a working Apache installation, what
can Lighttpd offer us?

"* Improved performance for most cases (as in more hits per
second)
* Reduced CPU time and memory usage
* Improved security

"Of course, the move to Lighttpd is not a small one, especially
if our Apache configuration makes use of its many features. Systems
tied into Apache as a module may make the move hard or even
impossible without porting the module to a Lighttpd module or
moving the functionality into CGI programs, if possible.

"We can ease the pain by moving in small steps. The following
descriptions assume that we have one Apache instance running on one
hardware instance. But we can scale the method by repeating it for
every hardware instance.

"When not to migrate
"Before we start this journey, we need to know that our hardware
and operating systems support Lighttpd, that we have root access
(or access to someone who has), and that the system has enough
space for another Lighttpd installation (yes, I know, Lighttpd
should reduce space concerns, but I have seen Apache installations
munching away entire RAID arrays). Probably, this only makes sense
if we plan on moving a big percentage of traffic to Lighttpd. We
also might make extensive use of Apache module, which means a
complete migration would involve finding or writing suitable
substitutes for Lighttpd."